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Two nodes in the PHP life cycle

Once PHP starts executing, it goes through two main phases:

The start phase before processing the request and the end phase after the request.

  • The beginning:

    • Module initialization phase (MINT), only once.
    • In the module activation phase (RINIT),PHP calls RINIT functions for all modules

  • End phase (PHP enters the end phase at the end of script execution or by calling exit() or die()).)

    • Disable module (RSHUTDOWN, corresponding to RINIT)

    • Shut down the module (MSHUTDOWN, corresponding to MINIT), exit the Web server, or exit the command line script after execution

Work done during the life cycle

(1)

(2) Initialize several global variables

(3) Initialize several constants

(4) Initialize Zend engine and summation components

(5) the parse PHP ini

(6) Initialization of global operation functions

(7) Initialize statically built modules and shared modules (MINIT)

(8) Disable functions and classes

(9) ACTIVATION

(10) Activate Zend engine

Activate SAPI (11)

(12) Environment initialization

(13) The module requests initialization

(14)

The php_execute_script function contains the entire process of running a PHP script

(15) DEACTIVATION

(16) flush

Sapi_flush flushes out the last contents

(17) Stop the Zend engine

What is the Zend engine?

The Zend engine is the heart of the PHP implementation and provides the infrastructure on which the language is implemented.

PHP syntax time limit, script compile and run environment, extension mechanism and memory management.

Many PHP extensions use the Zend API, which is an implementation of the PHP language itself. PHP only uses the Zend kernel to build the PHP language.

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